Kobkul is an amazing host: always cheerful and always ready to help.
On the day of our arrival, she actively tried to get in touch with us to make sure we we able to find the place alright - this can be tricky since with the address given Google Maps points you to the Wat Thepthidaram temple next to it. But even if you are unable to give Kobkul a call (like we were due to some issues with our phones), you can always ask one of the locals (not taxi- or tuk tuk drivers) to point you in the right direction; people are very friendly and even if they don't know 'Air Raid Shelter', they all know the popular (and very good!) Pad Thai restaurant directly opposite it.
Kobkul also took the time to help us get a taxi several times - if you are a Westerner like us who hasn't been to Bangkok yet, you should know that while it is extremely easy to *get* a taxi, you can also be sure that you will be ripped off very badly (we didn't have this problem anywhere else in Thailand by the way, but in Bangkok every single taxi driver or tuk tuk driver has tried to take advantage of us in some way). If Kobkul gets the taxi for you, you can be sure that you will get where you actually want to go and pay a fair price. She also lent us her umbrellas, let us use her phone, gave good advice, etc...
The location of the place is excellent, in the heart of the city. Still, don't expect to go everywhere on foot: distances between sights and places of interest in Bangkok are very big.
Considering this location in the centre of the capital and the excellent service that Kobkul provides, the price is very fair and gives excellent value for money. Our room was very basic but has everything you need: a comfortable bed (but like all beds in Thailand, very hard by Western standards), the Aircon works very well and gets the whole room cool in a matter of minutes, there's enough power outlets and a wardrobe to hang your clothes. The only 'downside' is probably the bathroom, which is shared between all the guests and contains both the shower and toilet in the same room. There is no curtain, so if someone takes a shower then *everything* gets wet. But this is really a very, very minor point against all the positives, especially considering the price that you pay.
If we ever return to Bangkok, we would definitely stay there again and can wholeheartedly recommend it to anyone else!